I am looking for a long list of best High school dramas . But It should include friendship and romance only .
I don't have any long list, but here are some that I completed:
Korean:
Japanese:
Chinese:
I haven't seen any K-dramas set in high school, but I can give you a few recommendations from other countries.
Japan:
GTO
1 Litre of Tears
Thailand:
The Gifted
Girl From Nowhere
School 2013, school 2015, solomon perjury
Korean: True Beauty
Extraordinary You is really good
18 Again is good but it's about a father who became young again after divorcing his wife and going back to high school and wooing her
Love Revolution is nice too with sweet romance
Boys Over Flowers